<template>
  <div>
   <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert title="添加商品信息" type="info" center :closable="false" show-icon></el-alert>
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息"></el-step>
            <el-step title="商品参数"></el-step>
            <el-step title="商品属性"></el-step>
            <el-step title="商品图片"></el-step>
            <el-step title="商品内容"></el-step>
            <el-step title="完成"></el-step>
        </el-steps>

        <!-- 标签页 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" 
                label-width="100px" label-position="top">
            <el-tabs v-model="activeIndex" tab-position="left"
                :before-leave="beforeTabLeave" @tab-click="tabCliked">
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                         <el-cascader
                            v-model="addForm.goods_cat"
                            :options="catelist"
                            :props="cateProps"
                            @change="handleChange">
                        </el-cascader>
                    </el-form-item>   
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单item项 -->
                    <el-form-item :label="item.attr_name" v-for="item in manyTabData"
                    :key="item.attr_id">
                        <!-- 复选框 -->
                        <el-checkbox-group v-model="item.attr_vals">
                            <el-checkbox :label="cb" v-for="(cb,i) in item.attr_vals" 
                            :key="i" border></el-checkbox>
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name" v-for="item in onlyTabData"
                    :key="item.attr_id">
                        <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action 上传后端接口 -->
                    <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess">
                        <el-button size="small" type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- 富文本 -->
                    <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                    <el-button type="primary" @click="add">添加商品</el-button> 
                </el-tab-pane>
            </el-tabs>
        </el-form>
    </el-card>

    <!-- 图片预览 -->
        <el-dialog
          title="图片预览"
          :visible.sync="previewVisible"
          width="50%">
          <img :src="previewPath" alt="">
        </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'
    export default {
        data(){
            return {
                activeIndex:'0',
                // 添加商品表单对象
                addForm:{
                    goods_name:'',
                    goods_price:0,
                    goods_weight:0,
                    goods_number:0,
                    // 商品所属分类数组
                    goods_cat:[],
                    // 图片数组
                    pics:[],
                    goods_introduce:'',
                    attrs:[]
                },
                addFormRules:{
                    goods_name:[
                        { required: true, message: '请输入商品名称', trigger: 'blur' },
                    ],
                    goods_price:[
                        { required: true, message: '请输入商品价格', trigger: 'blur' },
                    ],
                    goods_weight:[
                        { required: true, message: '请输入商品重量', trigger: 'blur' },
                    ],
                    goods_number:[
                        { required: true, message: '请输入商品数量', trigger: 'blur' },
                    ],
                    goods_cat:[
                        { required: true, message: '请选择商品分类', trigger: 'blur' },
                    ]
                },
                // 商品分类列表
                catelist:[],
                // 
                cateProps:{
                    label:'cat_name',
                    value:'cat_id',
                    children:'children',
                    expandTrigger: 'hover'
                },
                // 动态参数列表数据
                manyTabData:[],
                // 静态属性列表参数
                onlyTabData:[],
                // 上传图片地址
                uploadURL:`https://lianghj.top:8888/api/private/v1/upload`,
                // 图片上传组件请求头对象
                headerObj:{
                    Authorization:sessionStorage.getItem('token')
                },
                previewPath:'',
                previewVisible:false
            }
        },
        created(){
            this.getCateList()
        },
        methods:{
            // 获取所有商品分类
            async getCateList(){
               const {data:res} = await this.$http.get('categories')
               if(res.meta.status !== 200) return this.$message.error('获取商品分类失败')
               this.catelist = res.data
            },
            // 级联选择器选中变化
            handleChange(){
                if(this.addForm.goods_cat.length !== 3){
                    this.addForm.goods_cat = []
                    return
                }
            },
            //没有选择分类无法选择标签页 
            beforeTabLeave(activeName,oldActiveName){
                if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                    this.$message.error('请先选择商品分类!')
                    return false
                }
            },
            // 获取参数
            async tabCliked(){
                // 证明访问的是参数面板
                if(this.activeIndex === '1'){
                    const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                    {params:{sel:'many'}})
                    if(res.meta.status !== 200) return this.$message.error('获取参数失败')
                    res.data.forEach(item=>{
                       item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                    })
                    this.manyTabData = res.data 
                }else if(this.activeIndex === '2'){
                    const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
                     {params:{sel:'only'}})
                     if(res.meta.status !== 200) return this.$message.error('获取属性失败')
                    this.onlyTabData = res.data 
                }

            },
            // 处理图片预览效果
            handlePreview(file){
                console.log(file);
                 this.previewPath = file.response.data.url
                 this.previewVisible = true
            },
            // 处理移除图片的操作
            handleRemove(file){
                const filePath = file.response.data.tmp_path
                const i = this.addForm.pics.findIndex(x=>{
                    x.pic === filePath
                })
                this.addForm.pics.splice(i,1)
            },
            // 监听图片上传成功的事件
            handleSuccess(response){
                // 拼接得到一个图片信息对象 将对象push到pics数组中
                const picInfo = {pic:response.data.tmp_path}
                this.addForm.pics.push(picInfo)
            },
            add(){
                this.$refs.addFormRef.validate(async valid => {
                    if(!valid) return this.$message.error('请填写必要的表单项') 
                    // 添加 深拷贝
                    const form =  _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数与属性
                    this.manyTabData.forEach(item=>{
                        const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                        this.addForm.attrs.push(newInfo)
                    })
                    this.onlyTabData.forEach(item=>{
                        const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
                        this.addForm.attrs.push(newInfo)
                    })
                    form.attrs = this.addForm.attrs

                    // 发起请求 添加商品 商品名称必须唯一
                    const {data:res} = await this.$http.post('goods',form)
                    if(res.meta.status !== 201) return this.$message.error('添加商品失败!')
                    this.$message.success("添加商品成功");
                    this.$router.push('/goods')
                })
            }
        },
        computed:{
            cateId(){
                if(this.addForm.goods_cat.length === 3){
                    return this.addForm.goods_cat[2]
                }
                return null
            }
        }
    }
</script>

<style scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.el-button {
    margin: 10px 0;
}
</style>
